CN107556969A - A kind of working medium to be generated electricity for cold energy of liquefied natural gas organic Rankine bottoming cycle - Google Patents
A kind of working medium to be generated electricity for cold energy of liquefied natural gas organic Rankine bottoming cycle Download PDFInfo
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- CN107556969A CN107556969A CN201610512484.7A CN201610512484A CN107556969A CN 107556969 A CN107556969 A CN 107556969A CN 201610512484 A CN201610512484 A CN 201610512484A CN 107556969 A CN107556969 A CN 107556969A
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- cold energy
- natural gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Abstract
The invention discloses a kind of working medium to be generated electricity for cold energy of liquefied natural gas organic Rankine bottoming cycle, it is made up of following components and content, component 1：5%~90%；Component 2：5%~90%；Component 3：5%~30%.The component 1 is methane；The component 2 is any of ethene, ethane and fluoroform；The component 3 is any of propylene, propane and hexafluoropropene.Working medium of the present invention be used for overcritical LNG condensing heat-exchanges when, there is less heat transfer temperature difference, reduce the condenser temperature difference exchange heat caused by irreversible loss, greatly improve heat exchanger
Description
Technical field
The invention belongs to liquefied natural gas (LNG) cold energy use field, relates in particular to one kind and is used for liquefied natural gas
The working medium that cold energy organic Rankine bottoming cycle (ORC) generates electricity.
Background technology
During existing LNG cold energy ORC generates electricity, majority using pure refrigerants such as propane, due to propane and LNG heat exchange curves not
Match somebody with somebody, heat exchangerLess efficient, LNG high-grades cold energy can not obtain abundant cascade utilization, cause energy waste.
The content of the invention
In order to irreversible loss caused by solving existing for prior art temperature difference heat exchange is larger, LNG high-grade cold energy can not
The technical problem of abundant cascade utilization is obtained, being used for cold energy of liquefied natural gas organic Rankine bottoming cycle the invention provides one kind generates electricity
Working medium.
Provided by the present invention for cold energy of liquefied natural gas organic Rankine bottoming cycle generate electricity working medium by following components and content
Composition：
Component 1 5%~90%
Component 2 5%~90%
Component 3 5%~30%
The content of above each component is mass percent, in terms of the gross mass of working medium after each component physical mixed；
The component 1 is methane；The component 2 is any of ethene, ethane and fluoroform；The component 3 is
Any of propylene, propane and hexafluoropropene.
As further improved scheme, the content of above-mentioned each component is preferably：
Component 1 10%~80%
Component 2 10%~80%
Component 3 10%~30%
The content of above each component is mass percent, in terms of the gross mass of working medium after each component physical mixed.
Certainly, the component 2 can also be at least one of ethene, ethane and fluoroform；The component 3 can also
For at least one of propylene, propane and hexafluoropropene.
The selection of working medium each component should be reduced cold with improving heat exchanging fluid Curve MatchingFor the purpose of loss.LNG exists
In a supercritical state during 9.6MPa, LNG gasification process only has liquid phase region and gas phase zone, without two-phase latent heat area.LNG is in T-s
Figure upper curve is smooth ascending curve.And single working medium is under relatively low condensing pressure, condensation process typically by gas phase zone, often
Warm latent heat area, liquid phase region.Therefore limited, changed by pinch temperatures in LNG heat transfer process under single working medium and supercritical pressure
The hot temperature difference is larger, heat transfer processLose larger.It is close, no with LNG gasification Curve Matching, selection and LNG compositions to ensure
If with the dry ingredients of condensation temperature, mix according to a certain ratio, realize that mixed working fluid alternating temperature condenses.Due to LNG storage temperatures for-
162 DEG C, networking temperature is 5 DEG C, and general -162~-30 DEG C of cold energy uses value is higher, selected first, second and third component condensation temperature
Degree covers -162 DEG C~-30 high, normal, basic three temperature ranges respectively, and mixed working medium can be realized between -162~-30 DEG C in proportion
Alternating temperature condenses, higher with LNG gasification curve matching rate, considerably increases heat exchangerEfficiency.
The beneficial effects of the present invention are when this kind of mixed working fluid is used for overcritical LNG condensing heat-exchanges, have less
Heat transfer temperature difference, reduce the condenser temperature difference heat exchange caused by irreversible loss, greatly improve heat exchangerEfficiency.The present invention is mixed
Close working medium to be applied in LNG cold energy ORC electricity generation systems, more low temperature position can be obtained from LNG with greater efficiency, can be secondary
ORC or other cold energy uses provide cold, significant to the cascade utilization of the energy.
Embodiment
The mixed working fluid of the present invention is described further with specific embodiment below.
LNG cold energy ORC generating design conditions are taken as：LNG (9.6MPa, -162 DEG C) flow 60t/h, heat exchanger minimum temperature difference
5 DEG C, 5 DEG C of evaporating temperature.Embodiments of the invention are listed in 1~table of table 8 respectively with comparative example (propane).Wherein work in comparative example
Matter is pure propane, and 1~embodiment of embodiment 36 is mixed working fluid of the invention.
The comparative example of table 1 and 1~embodiment of embodiment 4
5~the embodiment of embodiment 9 of table 2
10~the embodiment of embodiment 14 of table 3
15~the embodiment of embodiment 19 of table 4
20~the embodiment of embodiment 24 of table 5
25~the embodiment of embodiment 29 of table 6
30~the embodiment of embodiment 34 of table 7
35~the embodiment of embodiment 36 of table 8
From 1~table of table 8, under identical heat exchanger pinch temperatures, embodiment condenser LMTD 8 DEG C~24 DEG C it
Between, less than LMTD30 DEG C of propane condensator, illustrate that embodiment and LNG heat exchange curve matching rates are preferable.Embodiment condenserEffect
Rate
Between 58%~88%, much larger than propane condensatorEfficiency 36.27%.Simultaneously in table under visible design conditions
Embodiment single cycle generated energy is less than propane generated energy, but single-stage circulation system middle outlet LNG and mixed working fluid in embodiment
Condensate liquid still has available cold energy, after the secondary propane ORC that connects utilizes the part cold energy generation, gross generation 1248~
1977kW, more than pure propane generated energy.
Claims (2)
1. a kind of working medium to be generated electricity for cold energy of liquefied natural gas organic Rankine bottoming cycle, it is characterised in that by following components and content
Composition：
Component 1 5%~90%
Component 2 5%~90%
Component 3 5%~30%
The content of above each component is mass percent, in terms of the gross mass of working medium after each component physical mixed；
The component 1 is methane；The component 2 is any of ethene, ethane and fluoroform；The component 3 be propylene,
Any of propane and hexafluoropropene.
2. working medium according to claim 1, it is characterised in that the content of each component is：
Component 1 10%~80%
Component 2 10%~80%
Component 3 10%~30%.
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| CN201610512484.7A CN107556969B (en) | 2016-06-30 | 2016-06-30 | Working medium for liquefied natural gas cold energy organic Rankine cycle power generation |
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| CN107556969B CN107556969B (en) | 2020-09-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112409993A (en) * | 2020-11-09 | 2021-02-26 | 江苏中圣高科技产业有限公司 | Safe and efficient mixed working medium suitable for LNG cold energy utilization |
| CN113736429A (en) * | 2021-09-07 | 2021-12-03 | 华中科技大学 | Environment-friendly mixed refrigerant and application thereof |
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| CN107556969B (en) | 2020-09-08 |
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